IPA: //ˌmækrəʊˈæɡrɪɡeɪt//
KK: /mækroʊˈæɡrɪɡeɪt/
A relatively large particle that is formed by the combination of smaller particles.
The soil contains many macroaggregates that help improve its structure and fertility.
Macroaggregate → It is formed from "macro-" (from Greek "makros", meaning large) and "aggregate" (from Latin "aggregare", meaning to gather together). The word "macroaggregate" refers to a large gathering or collection of particles or components.
Think of 'large' ('macro-') and 'gathering' ('aggregate') to remember that a macroaggregate is a large collection of things.